Trolley.



C. AALBORG.

THOLLEY.

APPLICATION HLED man. 30, 1914.

E15, 1918. SSHEET.1.

Patented 2 S E S S E N H W ATTORNEY c. AALBORG.

TROLLEY.

APPLICATION FILED MAR. 30, I914.

Patented Jan. 15, 1918.

2 SHEETSSHEET 2- WITNESSES ATTORNEY "mar earns auteur opinion CHRISTIAN AALIBORG, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T0 WES'IING- HOUSE ELECTRIC AND MANUFACTURING COMIPANY, A CORPORATION OF PENNSYL- VANIA.

masher.

Specification of Letters Patent.

2 TROLLEY.

Patented Jan, 15, rare.

'1 0 all whom it may concern:

Be it known that I, CHRISTIAN AALBoRo, a citizen of the Unlted States, and a resident of WVilkinsburg, in the county of Allegheny and State'of Pennsylvania, have invented a new and useful Improvement in Trolleys,

of which the following is a specification.

My invention relates to trolleys, and it has special reference to pantograph trolleys such as are commonly employed for collecting relatively large amounts of current from trolley conductors.

The object of my invention is to provide a current-collecting device of the alwve-indicated class which shall be simple and durable in construction, effective and reliable in operation, and particularly adapted to effect a good electrical engagement with a trolley conductor.

A further object of my invention is to provide a pantograph trolley, having it ourrent-collecting member adapted for engagement with a trolley conductor, in which the arrangement of parts is such that the collecting member is loosely and resiliently as sociated with the pantograph frame and so arranged that it is drawn along the trolley conductor behind the supporting frame, to a greater or less degree.

In the accompanying drawing, Figure 1 is a view, partially in section and partially in end elevation, of a portion of a device constructed in accordance with my invention, Fig. 2 is another similar view of the device shown in Fig. 1, the section being taken in a different plane and the parts being shown in the positions which they occupy when the device is in its lowest or inoperative position, and Figs. 3 and i are, respectively, a plan view, and a View, aartially in section and partially in side elevation, of a portion of the structure.

Referring to the drawings, the apparatus shown comprises a pantograph supporting frame 1, a current-collecting member 2, a plurality of sets of links 8 and 4, a plurality of yokes 5, and a plurality of springactuated devices 6. It should be understood that, although only one end of the structure is shown, the other end thereof is of like construction.

The pantograph frame 1 may be of any well-known construction, and, since this type of mechanism is well-known in the art, no detail description thereof will be given. However it preferably embodies a plurality of sets of members 10 and 11 which support the respective ends of the member 2. The members 10 and 11 are pivotally secured together by means of a rod 12 and are respectively provided with lugs 13 and 14.

The yokes 5 are disposed at the respective ends of the collecting member 2 and each is provided with slotted openings 15 and 1.6 through which pins 17 and 18 project, the latter pins being associated with the lugs 13 and 14, respectively. The yoke 5 is also provided with a web 19 which is located in substantially the middle Portion of the yoke and has an opening 20. The links 3 and 4 are provided with elongated slots 21 and 22, and the lower ends of said links have pin-and-slot connections with the lugs 13 and 1d, the pins 17 and 18 projecting through the slotted openings 21 and 22, re-- spectively. The upper ends of the links 3 and a are pivotally associated with the current-collecting member 2 in a suitable man.

ner, and the points of connection are located near the respective sides of said member.

The current-collecting member 2 comprises a central working portion which is adapted for sliding electrical engagement, with a trolley conductor, and a plurality of downwardly curved end portions which serve as guards, in the usual manner. The working portion 25 of the member is relatively wide, and is intended to engage a trolley conductor throughout its entire width. The member 2 embodies a plurality of socket members 28 which are located in the central longitudinal plane of the currentcollecting member 2 and in vertical relation to'the openings 20 in the webs 19 of the yokes 5.

Each of the spring-actuated devices 6 comprises a rod 30, the upper end of which is provided with a rounded head or ball portion 31 which is adapted to be received by the socket 28, and its lower end projects loosely through the opening 20 in the web 19. The rod 30 is further provided with a shoulder 32 between which and the web 19, a coil spring 84 is interposed, the spring 3 1 surrounding the rod 30. Bracket stops 36 are attached to the member 2 for restricting the movement of the said member at the links 3 and 4 with respect to the frame 1.

In order to effectively conduct current Hill from the current-collecting member 2 to the pantograph frame 1, a plurality of flexible shunts (not shown) of conducting material may be employed. 7

Referring particularly to Fig. 1, which shows the apparatus in its elevated position, it is seen that the spring-actuated devices 6 act in the central longitudinal plane of the current-collecting member 2 substantially mid-way between the points of pivotal connection of the sets of links 3 and 4, and said devices 6 serve to resiliently support said member 2 and to maintain it in its operative position.

VVhen the pantograph trolley is moved along a trolley conductor, the frictional engagement therewith causes the member 2 to be drawn along slightly behind the pantograph frame by means of the forwardset of links 3, while the rear set of links at perform no useful function. The relative positions of the member 2 and the links 3 and t will be as shown in Fig. 2, although this figure is intended to illustrate the lowered position of the pantograph. Engagement with the trolley conductor, throughout the entire width of the member 2, is eifected by means of the spring-actuated devices 6.

If the travel is in the opposite direction, the first mentioned set of links 3 becomes inoperative and the second set referred to, serves to draw the member :2 along the trolley conductor.

The lowering of the pantograph frame 1 is permitted by the pin-and-slot connection between the lugs 13 and 14 and the upper ends of the yokes 5. The relative positions of the various parts in the lowered position of the apparatus is shown in Fig. 2.

I contemplate a variety of modifications of my invention as set forth, which are intended to be covered by the appended claims.

I claim as my invention: a

1. The combination with a pantograph frame, of yoke members associated there- With, a current-collecting member, a plurality of links interposed between said frame and said current-collecting member,

and resilient means interposed between said yoke members and said current-collecting member. p l

2. The combination with a pantograph frame and a current-collecting member, of y-okes having pin-and-slot connections with said frame, slotted links connecting said currentcollecting member to said frame, and spring-actuated members interposed between sald collecting member and said yokes and acting in the central longitudinal plane of said member.

3. A pantograph trolley comprising a frame, a contact shoe, a pluralityof pairs of slotted links for connecting said shoe to said frame, a yoke connecting the slotted portions of each pair of links, and a resilient member interposed between each pair of said links and engaging said yoke and said shoe. a

a. A pantograph trolley comprising a frame, a contact shoe, a plurality of pairs of links for mountingsaid shoe on'said frame, a yoke engaging each pair of links and resilient means in compression between said contact shoe and said yoke.

In testimony whereof, I have hereunto subscribed my name this 23rd day of Man,

CHRISTIAN AALBORG. lVitnesses:

Tnos. S. Pnnnnnn, B. B. HINES.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents.

Washington, D. G. 

